Scheme 3.
(a) NH2CH2CH2NH2, 50 °C for 18 h; (b) EtOH/H2O NaHCO3, pH 8 30 min.; (c) 0.5 M borate buffer, pH 9, 18 °C 3 d.; (d) 0.5 M borate buffer, pH 9, 18 °C 2 d.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.